Yeah. I don't buy it at all. Torque converters are KNOWN to artificially inflate dyno torque numbers.
Look how fast it dips. That's the converter. The torque doesn't magically go away like that.
Once the turbine, impeller and stator reach the same speed, multiplication stops and torque drops.
The only accurate dyno for an auto is with a locked converter. And I'm willing to bet a considerable amount the OP didn't have his locked.